I'll be trying that next week - thanks!
It worked like a charm!! Thanks.
I think I've solved it. I'll created a contacts file with one entry per person, create personal links for them and download the CSV file and copy the same personal link for one person to each of that person's email addresses and mail through my system.
I want them to answer the survey once, but don't know their main email. So they will get multiple invites (one for each email).
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